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<div class="title">image_scaling.cl</div>  </div>
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<a href="image__scaling_8cl.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * This confidential and proprietary software may be used only as</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * authorised by a licensing agreement from ARM Limited</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *    (C) COPYRIGHT 2013 ARM Limited</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> *        ALL RIGHTS RESERVED</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * The entire notice above must be reproduced on all authorised</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * copies and copies may only be made to the extent permitted</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> * by a licensing agreement from ARM Limited.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">/* [Define a sampler] */</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"><a class="code" href="image__scaling_8cl.html#a9165c6046146d2d28cc268394d585f17">   12</a></span>&#160;<span class="keyword">const</span> sampler_t <a class="code" href="image__scaling_8cl.html#a9165c6046146d2d28cc268394d585f17">sampler</a> = CLK_NORMALIZED_COORDS_TRUE | CLK_ADDRESS_CLAMP | CLK_FILTER_LINEAR;</div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">/* [Define a sampler] */</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno"><a class="code" href="image__scaling_8cl.html#a2f2c7656161bcd4a3956c362d0052b26">   22</a></span>&#160;__kernel <span class="keywordtype">void</span> <a class="code" href="image__scaling_8cl.html#a2f2c7656161bcd4a3956c362d0052b26" title="Image scaling kernel function.">image_scaling</a>(__read_only image2d_t sourceImage,</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;                            __write_only image2d_t destinationImage,</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;                            <span class="keyword">const</span> <span class="keywordtype">float</span> widthNormalizationFactor,</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;                            <span class="keyword">const</span> <span class="keywordtype">float</span> heightNormalizationFactor)</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;{</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">     * It is possible to get the width and height of an image object (using get_image_width and get_image_height).</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">     * You could use this to calculate the normalization factors in the kernel.</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">     * In this case, because the width and height doesn&#39;t change for each kernel,</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">     * it is better to pass normalization factors to the kernel as parameters.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">     * This way we do the calculations once on the host side instead of in every kernel.</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    <span class="comment">/* [Calculate the coordinates] */</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">     * There is one kernel instance per pixel in the destination image.</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">     * The global id of this kernel instance is therefore a coordinate in the destination image.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    int2 coordinate = (int2)(get_global_id(0), get_global_id(1));</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment">     * That coordinate is only valid for the destination image.</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment">     * If we normalize the coordinates to the range [0.0, 1.0] (using the height and width of the destination image),</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">     * we can use them as coordinates in the sourceImage.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    float2 normalizedCoordinate = convert_float2(coordinate) * (float2)(widthNormalizationFactor, heightNormalizationFactor);</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <span class="comment">/* [Calculate the coordinates] */</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    <span class="comment">/* [Read from the source image] */</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">     * Read colours from the source image.</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">     * The sampler determines how the coordinates are interpreted.</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">     * Because bilinear filtering is enabled, the value of colour will be the average of the 4 pixels closest to the coordinate.</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    float4 colour = read_imagef(sourceImage, <a class="code" href="image__scaling_8cl.html#a9165c6046146d2d28cc268394d585f17">sampler</a>, normalizedCoordinate);</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    <span class="comment">/* [Read from the source image] */</span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;    <span class="comment">/* [Write to the destination image] */</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">     * Write the colour to the destination image.</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">     * No sampler is used here as all writes must specify an exact valid pixel coordinate.</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    write_imagef(destinationImage, coordinate, colour);</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="comment">/* [Write to the destination image] */</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;}</div>
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